maesh



NITED STATES "PATENT OFFICE.

CLARK MARSH AND DANlEL E. MARSH, OF BRIDGEPORT, CONNECTICUT, ASSIGNORS TO WHEELER & WILSON MANUFACTURING COMPANY, OF

SAME PLACE.

BOBBIN- HOLDER OR RING-SLIDE FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 227,696, dated May 18, 1880.

Application filed November 3, 1879.

To all whom it may concern:

' Be it known that we, CLARK MARSH and DANIEL E. MARSH, both of Bridgeport, in Fairfield county, State of Connecticut, have invented an Improvement in Bobbin-Holders or Ring-Slides for SewingMachines, of which the following is a specification.

This invention relates to improvements in bobbin-holders or ring-slides such as are used in the Wheeler 85 Wilson sewing-machine, and is an improvement on United States Patent No. 207 ,400, dated August 27, 1878.

looseness of the said upright portion, and,

consequently, obviate irregularity of hold or pressure upon the disk-bobbin.

In this our invention we employ a hooked arm composed of quite rigid yet spring metal, one end of which, made as a hook, engages the uprightportion of the rin g-slide, while the other end is curved to embrace or rest against the rounded rear portion of the base of the ringslide, the said spring-hook being adjustably connected with the said base by a screw or equivalent device. The rear end of the said spring-armis of such curvature with relation 4 to the curve of the said base, and the arm is .of such length with relation to the length of the base, that were it not held distended by the action of the screw, which forces it against the said curved base, the said spring-arm would be too short for its hooked or front end to engage the lower part of the upright part of the ring-slide.

Figure 1 represents, in front view, a bobbinholder or ring-slide provided with our improvements; Fig. 2, a side elevation thereof; Fig. 3, a sectional top view, a portion of the base being broken away to show the springarm and its operatinglever, and Fig. 4: a view of the spring-arm separated from the base and in its normal position.

The upright portion a, pivoted to the base b at 2, and the bobbin-pressing spring a are all as commonly employed in the Wheeler 82; Wilson sewing-machine, and their action need not therefore be herein further described. The spring-arm 0, made of quite stiff steel, has at its forward end a lip, 3, to engage the lower portion, 4, of the upright to. Its rear end is curved, as at 5, to extend about the curved end or rear part, 6, of the base I), as in Fig. 3,

and is provided with a slot of greater diameter than the diameter of the shank of the screw 0, which is employed to hold the said springarm up to the base b. The curve of the rear of the spring-arm is such, compared with the curve of the base, and its length is such, that as it is'acted upon by the screw 0 to force the spring-arm against the side of the base the said spring-arm will be straightened.

With the parts constructed in this way, it is obvious that the more the said spring-arm is forced against the said base by the screw ethe more it will be elongated, until the spring-arm andbase come in close contact for the whole length of the arm.

To apply the parts, place the part a of the bobbin-holder in its upright position, place the lip 3 of the spring-arm against its outer face at 4, andjnsert the screw e into the hole in the arm and into the threaded hole made for it in the base, and then turn the sci-ewe until the arm is clamped between the side of the base and the head of the screw. During the time the screw is being so turned in the curved end of the arm rides along over the differentlycurved base, and the arm is drawn longitudinally in the direction of the arrow, causing the lip 3 to press the part 4 very firmly, holding the same so tightly that the upright part cannot get loose. To lift the spring-arm and permit the upright part to be turned back, as in dotted lines, Fig. 2, we have provided the lever g, pivoted at h to the base, so as to fall behind the arm.

If the part- 4 of the upright becomes worn away by the action of the lip upon it, it is only necessary to loosen the screw e and again turn it in, as before, when the lip will be drawn closely against the part 4.

Any suitable form of levers or other equivalent device may be employed to operate the arm and remove the lip from before the part 4.

We are aware that a spring connected with the base of the ringslide and operated by a bolt has been used to maintain the ring-slide bracketin vertical position, as in United States Patent No. 207,400. Our spring-arm 0, made rigid, shaped, and attached, as described, to the base of the ring-slide, is more positive in its operation than the like spring shown in the said patent.

We claim 1. In a bobbin holder or ring-slide, the spring-arm c, curved as described, and provided with lip 3, combined with the pivoted upright, the base, curved as described to receive against it the curved portion of the spring, and the screw to operate the said arm,

as described, and cause the lip to engage and lock the upright.

2. The pivoted upright a, the base 0, curved as described, the curved spring arm 0, having 

